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Linux command: grep - Global Regular Expression Print

grep command
grep command

grep, egrep, fgrep, rgrep - print lines matching a pattern

Using grep to view/display content of /etc/rsyslog.conf file without comment lines

$ grep ^[^#] /etc/rsyslog.conf

Using ls and grep to list disks and partitions

$ ls /dev | grep '[s|v|x]d$*'
sda
sda1
sda2
sda3
sda4

--invert-match

grep -iv 'that' file.txt : Show lines that do not contain'that'

egrep - keep only those lines which have at least one of the following words: the, that, then, those.

egrep -iw 'the|that|then|those'

Use 'egrep' or 'grep -E'

egrep 'the|that|then|those'
grep -E 'the|that|then|those'

Extract lines with exactly 11 characters

grep -E "^.{11}$" /usr/share/wordlists/rockyou.txt > /usr/share/wordlists/rockyou-11.txt




Practice


THM | Regular Expressions



Other resources about grep



GNU Grep 3.5




















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